[onedayjake]

Originally Posted by iluvmy72

OK....so you didn't have to use the harness from painless? I am doing a similar swap but I am using a vortec 454 from a 1998 2500 in my 1991 burb. But you probably ran into the same issues as I am about to. I have been told I can't use the stock harness and have to go with a custom made one from painless or Howell. These are Howell techs that have told me this and I almost believed them until I saw this post. If you used the stock version, I'd like to see pics on how you ran your dash connections with as much info as you can give. I will contact painless on their "auxiliary fuse box" thing a ma jig and see if it can work for me. Did you need your computer to be re-programmed? I am so close to finishing my burb. The vortec 454 is in along with the computer. I need to put the 4L80E tranny and NP-241C transfer case(passenger side drop) in and finish the wireing. The wireing is my biggest hold up so far. But I have the ODB2cats ready for the dual exhaust setup as well as all four 02 sensors that are brand new. What else can I be missing?

Oh I think it's such a shame people waste so much money on an aftermarket harness. I'm fortunate enough to work in a shop that has Alldata so wiring diagrams were easy for me to print out for both trucks and weed out what I didn't need. The PCM itself just needs battery positive, ignition positive and grounds. Alot of the harness is self contained. You will need to run some wires inside for the data link connector, tach, etc.
This is the fuse block I used I think or one like it.
http://www.jegs.com/i/Painless+Perfo...70107/10002/-1
I did have to program the theft out of the PCM, I did it with HP tuners.